He also has a submarine with gold plating, equipped with laser weaponry, titanium grapplers, cloaking devices, and depth charges.
en.wikipedia.org A layer of a suitable barrier metal, usually nickel, is often deposited on the copper substrate before the gold plating.
en.wikipedia.org Gold hydroxide is used in medicine, porcelain making, gold plating, and daguerrotypes.
en.wikipedia.org Although it has a lower conductivity than copper and silver, gold plating is also used, because unlike copper and silver, it does not corrode.
en.wikipedia.org In addition, a black-pad of nickel oxide would form during the immersion gold plating step, greatly reducing solder joint reliability.
en.wikipedia.org